This makes enough for about 10 barbecues. It freezes well and makes a great gift too.

6 cups tomato sauce, homemade or commercial
3 cups mild chili sauce, homemade or commercial
1 1/2 cups cider vinegar
3/4 cup Worcestershire sauce
1 cup liquid hickory smoke (available in supermarkets)
6 tablespoons molasses
3 teaspoons Tabasco sauce, or to taste
1 1/2 cups brown sugar
2 extra large onions, chopped
1 large lemon, sliced
1 medium orange, sliced
1 large lime, sliced
6 teaspoons dry powdered mustard
1 cup Jack Daniels whiskey or bourbon (optional)
Salt and freshly ground black pepper to taste

Combine all ingredients in a large saucepan, bring gently to a boil, then reduce heat to low and simmer, covered, for 30 minutes. Stir from time to time to prevent scorching.

Pass the sauce through a fine sieve to remove the solid ingredients, pour into clean storage jars, and freeze.